We're trying to share a folder of documents with everyone in our company, and we can't quite figure out how to do that, short of clicking "share folder" and then listing off every member of our company (which is not really a good option). Anyone have any advice?

Initially Company Drive has been designed for that - you can configure general settings for the Company Drive allowing everyone to see the files (e.g. all visitors = read). Or you can configure permissions for the particular folder in the Company Drive, but in this case you won't have "all visitors" option at your disposal, and you will need to open department & click for all department & employees & include individual users as well (not belonging to any department).